Peoria County vs Rock Island County

A side-by-side comparison of Peoria County and Rock Island County: population, income, housing, and more.

Peoria County and Rock Island County are counties in Illinois. This page compares them across population, income, housing, education, commuting, and how each has changed since 2019.

Peoria County has the higher population (179,831 vs 142,995 in Rock Island County). Rock Island County has the higher median household income ($66,768 vs $64,938 in Peoria County). Peoria County has the higher median home value ($152,600 vs $144,700 in Rock Island County).

Population, income & housing

	Peoria County	Rock Island County
Population	179,831	142,995
Median age	38.1 yrs	40.3 yrs
Median household income	$64,938	$66,768
Median home value	$152,600	$144,700
Median gross rent	$946	$863
Housing units	84,992	66,742
Homeownership rate	67.0%	68.6%
Bachelor's degree or higher	34.5%	24.1%
Unemployment rate	6.5%	5.7%

Trends (ACS 5-year, 2019–2023)

	Peoria County	Rock Island County
Population	182,770 → 179,831 (-1.6%)	143,873 → 142,995 (-0.6%)
Median household income	$55,842 → $64,938 (+16.3%)	$54,858 → $66,768 (+21.7%)
Median home value	$129,800 → $152,600 (+17.6%)	$119,400 → $144,700 (+21.2%)
Median gross rent	$798 → $946 (+18.5%)	$748 → $863 (+15.4%)

Peoria County

Population

182,770179,831

Median household income

$55,842$64,938

Median home value

$129,800$152,600

Median gross rent

$798$946

Rock Island County

Population

143,873142,995

Median household income

$54,858$66,768

Median home value

$119,400$144,700

Median gross rent

$748$863

Age & race/ethnicity

Age distribution (share)

	Peoria County	Rock Island County
Under 5	6.6%	5.9%
5 to 17	17.3%	16.7%
18 to 24	8.7%	8.8%
25 to 34	13.2%	12.0%
35 to 44	12.5%	12.2%
45 to 54	11.5%	11.4%
55 to 64	12.2%	13.0%
65 to 74	10.4%	11.7%
75 and over	7.6%	8.4%

Race & ethnicity (share)

	Peoria County	Rock Island County
White (non-Hispanic)	67.0%	68.5%
Black or African American	17.5%	10.4%
American Indian & Alaska Native	0.1%	0.1%
Asian	4.5%	2.5%
Native Hawaiian & Pacific Islander	0.0%	0.0%
Some other race	0.3%	0.2%
Two or more races	4.9%	4.2%
Hispanic or Latino	5.8%	14.0%

Educational attainment (age 25+)

Share of adults 25+

	Peoria County	Rock Island County
No high school diploma	6.6%	9.8%
High school graduate	27.7%	30.7%
Some college or associate's	31.2%	35.5%
Bachelor's degree	20.8%	15.1%
Graduate or professional degree	13.7%	9.0%

Commute to work

How workers get to work (share)

	Peoria County	Rock Island County
Drove alone	77.8%	79.1%
Carpooled	8.3%	8.3%
Public transit	1.1%	1.5%
Walked	1.9%	3.2%
Bicycle	0.2%	0.2%
Worked from home	10.0%	6.7%
Other means	0.7%	1.0%

Housing

Units in structure (share)

	Peoria County	Rock Island County
1-unit, detached	72.1%	69.9%
1-unit, attached	3.7%	4.1%
2 to 4 units	5.1%	7.2%
5 to 19 units	10.0%	8.7%
20 or more units	7.9%	7.6%
Mobile home & other	1.2%	2.5%

Poverty & households

	Peoria County	Rock Island County
Poverty rate	15.4%	15.4%
Average household size	2.27	2.26
Mean commute (minutes)	19	20
Median year structure built	1966	1962